12155587 has 2 divisors, whose sum is σ = 12155588. Its totient is φ = 12155586.

The previous prime is 12155581. The next prime is 12155617. The reversal of 12155587 is 78555121.

It is a weak prime.

It is an emirp because it is prime and its reverse (78555121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12155587 - 2³ = 12155579 is a prime.

It is not a weakly prime, because it can be changed into another prime (12155581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077793 + 6077794.

It is an arithmetic number, because the mean of its divisors is an integer number (6077794).

Almost surely, 2^12155587 is an apocalyptic number.

12155587 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155587 is an equidigital number, since it uses as much as digits as its factorization.

12155587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14000, while the sum is 34.

The square root of 12155587 is about 3486.4863401425. The cubic root of 12155587 is about 229.9280619380.

The spelling of 12155587 in words is "twelve million, one hundred fifty-five thousand, five hundred eighty-seven".